Motor-generator.



A. E. DOMAN.

MOTOR GENERATOR. APPLICATION mzn JULY 21.1914.

\ 1,247,650. Patented Nov. 1917.

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clam A. E. DOMAN.

MOTOR GENERATOR.

APPLICATION FILED JULY 27,1914.

1 ,24:7,650 Patented Nov. 27, 1917.

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Application filed J'u1y27,1914;. sa-almisam To all whom it may concern:

Be it known that I, ALBERT E. DQMA-N, a citizen of the United States, and resident of Elbridge, in the county of Onondaga, in the Stateof New York, have invented new and useful Improvements in Motor-Generators,

of which the following, taken in connection with the accompanying drawings, is a full,

clear, and exact description. v

I This invention relates to certain improve- "ments in dynamo electric machines of the classshown in my pending application Serial No. 846,756, filed J une 23, 1914, except I that it relates more particularly to the con- I struction of the casing for inclosing the armature, field windings and commutator.

. The main object is to reduce the weight and at the same time to increase the strength and durability of the case or housing, with- 201" out sacrificing its magnetic efiicienc Another object is to reduce the cost of production by making the main shell and its reinforcing shell or tube to exact sizes so that they may be interfitted and the various adjuncts of the complete machine assembled thereon without laborious or expensive mill- Other objects and uses of specific parts of the casing will be brought out in the follow- "ing description.

i In the drawings- Figures 1, 2 and 3 are respectively a side elevation and opposite end views of a dynamo electric machine embodying the various features of my invention.

Figs. 4,5 and 6 are respectively a longitiu dinal section and transverse sections taken on lines 4-4, 55 and 66, Fig. 1, omitting the armature, field windings and bearings for-said armature.

150 inwardly forming flanges -4.- to which a cover-plate or head 5 may be secured by therewith. Y

A reinforcing shell or tube -11 of mag netizable sheet metal and preferably of pressed steel is .tightly fitted flat-wise within the polygonal portion of the shell -1- and is therefore of substantially the sametransverse form and exterior size as the interior of this portion of the shell so as to contact therewith at all points and thereby not only strengthen the shell but also build up its magnetic field to the desired cross section, it being understood of course that the sides of the shell and its reinforcement are substantially fiat.

The length of this reinforcement is somewhat less than that of the larger portion of the shell in which it is mounted and terminates short of the ends thereof to'correspond approximately to the length of the pole pieces, as 12', which are secured against the inner faces of the flat sides of the reinforcement by screws 13 passing through registering bolt holes in the shell 1. and ring -11-- so that the same screws serve to hold the shell, ringand pole pieces in fixed relation.

. The cylindrical portion of the case is provided with a circumferentially elongated opening 15- in one side thereof to permit access to the commutator and its brushes for adjustment or repairs, said opening being normally closed by sliding cover -1.6- preferably of light sheet metal fitted on the periphery of the shell to form a dust proof joint but movable to one side of the opening when necessary. I

By using pressed steel for the main shell and its reinforcement, the weight of the case may be greatly reduced and its strength and durability greatly increased, the reinforcing ring serving not only to stifien the case but also to give it the necessary field for magnet circuits.

What I claim is A case for dyneme electric machines comprising two coaxial pressed steel tubes, both magnetizable and tightly fitted one within the other so as to contact fiatwise at all points about-their axes, pale pieces in contact with the inner face ef the inner tube,

and. clamping bolts passed through both tubes and engaged with the pole pieces for clamping the inner tube firml to the outer tube, and holding the pole pwew in operative position.

In witness whereof I have hereunto set my hand this 20th day of July, 1914.

ALBERT E. DOMAN. Witnesses E. R. LA GARSE, F. H. DOWNEY. 

